Rankine to Réaumur Conversion

This guide explores the conversion between the Rankine and Réaumur temperature scales, offering a comprehensive overview and the necessary formula.

The Rankine Scale: An Absolute Perspective

The Rankine scale, a tribute to the visionary engineer William John Macquorn Rankine, stands as an absolute thermodynamic temperature scale. Its defining characteristic lies in its zero point, perfectly aligned with absolute zero – the theoretical point where all molecular motion ceases. Notably, the Rankine scale shares the same unit size as the Fahrenheit scale.

The Réaumur Scale: A Historical Perspective

The Réaumur scale, a creation of the brilliant French scientist René Antoine Ferchault de Réaumur, employs a unique framework. On this scale, the freezing point of water is designated as 0°Ré, while the boiling point of water marks 80°Ré.

Bridging the Scales: The Conversion Formula

To seamlessly transition between these two distinct scales, we utilize the following formula:

°Ré = (°R - 491.67) * (4/9)

  • °Ré: Temperature expressed in degrees Réaumur.
  • °R: Temperature expressed in degrees Rankine.
Rankine Réaumur Rankine Réaumur Rankine Réaumur Rankine Réaumur
1°R-218.08ºRé21°R-209.19ºRé41°R-200.30ºRé61°R-191.41ºRé
2°R-217.63ºRé22°R-208.74ºRé42°R-199.85ºRé62°R-190.96ºR
3°R-217.19ºRé23°R-208.30ºRé43°R-199.41ºRé63°R-190.52ºRé
4°R-216.74ºRé24°R-207.85ºRé44°R-198.96ºRé64°R-190.08ºRé
5°R-216.30ºRé25°R-207.41ºRé45°R-198.52ºRé65°R-189.63ºRé
6°R-215.85Ré26°R-206.96ºRé46°R-198.08ºRé66°R-189.19ºRé
7°R-215.41ºRé27R-206.52ºRé47°R-197.63ºRé67°R-188.74ºRé
8°R-214.96ºRé28°R-206.08ºRé48°R-197.19ºRé68°R-188.30ºRé
9°R-214.52ºRé29°R-205.63ºRé49°R-196.74ºRé69°R-187.85ºRé
10°R-214.08ºRé30°R-205.19Ré50°R-196.30ºRé70°R-187.41ºRé
11°R-213.63ºRé31°R-204.74ºRé51°R-195.85ºRé71°R-186.96ºRé
12°R-213.19ºRé32°R-204.30ºRé52°R-195.41ºRé72°R-186.52ºRé
13°R-212.74Ré33°R-203.85ºRé53°R-194.96ºRé73°R-186.08ºRé
14°R-212.30ºRé34°R-203.41ºRé54°R-194.52ºRé74°R-185.63ºRé
15°R-211.85ºRé35°R-202.96ºRé55°R-194.08ºRé75°R-185.19ºRé
16°R-211.41ºRé36°R-202.52ºRé56°R-193.63ºRé76°R-184.74ºRé
17°R-210.96ºRé37°R-202.08ºRé57°R-193.19ºRé77°R-184.30ºRé
18°R-210.52ºRé38°R-201.63ºRé58°R-192.74ºRé78°R-183.85ºRé
19°R-210.08ºRé39°R-201.19ºRé59°R-192.30ºRé79°R-183.41ºRé
20°R-209.63ºRé40°R-200.74ºRé60°R-191.85ºRé80°R-182.96ºRé